MESON Chess Problem Database

Problem Display
PID: 250173 (Q4bbB/q6B/r1r3P1/6pN/nR1PkNP1/2P5/1pPP2K1/8 w - - 0 1)

Neunivako, Pavel Efimovich

64 Shakhmatnoe obozrenie, 1927

Q4bbB/q6B/r1r3P1/6pN/nR1PkNP1/2P5/1pPP2K1/8

#2

13 + 9

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Rxd4#
    • 1...Ba2
      • 2.g7#
    • 1...Bb3
      • 2.g7#
    • 1...Bc4
      • 2.g7#
    • 1...Bf7
      • 2.gxf7#
    • 1...Sc5
      • 2.d5#
    • 1...gxf4
      • 2.Sf6#
  • Tries
    • 1.Be5?
      • threat
        • 2.Sg3#
        • 2.Sf6#
      • 1...Qxa8
        • 2.Sg3#
      • 1...gxf4
        • 2.Sf6#
      • 1...Qb7
        • 2.Sg3#
      • 1...Qe7
        • 2.Sg3#
      • 1...Qf7
        • 2.Sg3#
      • 1...Qg7
        • 2.Sg3#
      • 1...Be7
        • 2.Sg3#
      • 1...Bg7
        • 2.Sg3#
      • 1...Bd5
        • 2.Sg3#
      • 1...Qxd4!
    • 1.Qxc6+?
      • 1...Bd5
        • 2.Qxd5#
        • 2.g7#
      • 1...Rxc6!
  • Keys
    • 1.Kf2!
      • threat
        • 2.d3#
      • 1...Qxd4+
        • 2.Rxd4#
      • 1...gxf4
        • 2.Sf6#
      • 1...Bc4
        • 2.g7#
      • 1...Sc5
        • 2.d5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • Q(g);OGATE,P_SPINQ(g),XP(F)::R1(E),XQ(g)
    • B(i);N_GUARD::B(K)+P(J)
    • B(i);OGATE::B(K)+P(J),XB(i)
    • S(b);S_CUTB(h),S_CUTQ(g)::R(E)+P(F)
    • P(d);SBLOCK,XS(G)::S(I)
  • Tries
    • Try
      • B(M);
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);N_SPINR(f),XQ(L)::S(I)
        • P(d);XS(G)::S(I)
        • Q(g);N_SPINR(f)::S(I)
        • Q(g);::S(I)
        • B(h);::S(I)
        • B(i);N_SPINR(f)::S(I)
      • Refutation
        • Q(g);P_SPINQ(g),XP(F)
    • Try
      • Q(L);CHECK,XR(f)
      • Refutation
        • R(e);XQ(L)
  • Actual
    • K(C);P-FLIGHT,P_SPINP(F)
    • Threat
      • P(B)
    • Vars
      • Q(g);CHECK,OGATE,P_SPINQ(g),XP(F)::R1(E),XQ(g)
      • P(d);SBLOCK,XS(G)::S(I)
      • B(i);N_GUARD::B(K)+P(J)
      • S(b);N_PINP(F)::R(E)+P(F)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).